读某地区的经纬网和等高线图，回答下列小题。图中甲地区土地盐碱

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读某地区的经纬网和等高线图，回答下列小题。

图中甲地区土地盐碱化较轻、耕地质量较好的自然原因是（）

A．人类长期耕作，形成了肥沃的水稻土

B．多为紫色土，冲积土壤比较肥沃

C．土壤中水、肥、气、热条件协调较好，肥力高

D．土壤中含钙质较多，黑土分布广

图中乙地区的经济作物和林木主要为（）

A．甘蔗、柑橘	B．甜菜、柑橘
C．花生、苹果	D．棉花、茶树

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